Conor McGregor celebrates after a first-round knockout victory over Jose Aldo in their featherweight title fight during UFC 194 on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

Conor McGregor leaves the Octagon after his first-round knockout victory over Jose Aldo in their featherweight title fight during UFC 194 on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

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Yoel Romero

Yoel Romero celebrates after a middleweight fight against Ronaldo Souza during UFC 194 on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

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Jocelyn Jones Lybarger

Jocelyn Jones-Lybarger (L) takes a punch from Tecia Torres in a strawweight fight during UFC 194 on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

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Luke Rockhold

Luke Rockhold celebrates with a member of his team after beating Chris Weidman in their middleweight title fight during UFC 194 at MGM Grand Garden Arena on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

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Chris Weidman

Chris Weidman leaves the arena after losing to Luke Rockhold in their middleweight title fight during UFC 194 at MGM Grand Garden Arena on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

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Luke Rockhold

Luke Rockhold (top) wrestles with Chris Weidman in their middleweight title fight during UFC 194 on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

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Tecia Torres

Tecia Torres (L) celebrates her victory over Jocelyn Jones-Lybarger in a strawweight fight during UFC 194 on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

A doctor checks out Gunnar Nelson after his welterweight fight against Demian Maia during UFC 194 at MGM Grand Garden Arena on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

Luke Rockhold (L) walks away from a bloodied Chris Weidman after a fourth-round TKO in their middleweight title fight during UFC 194 at MGM Grand Garden Arena on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)

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Leonardo Santos

Leonardo Santos (C) celebrates his victory over Kevin Lee in their lightweight fight during UFC 194 on December 12, 2015 in Las Vegas, Nevada. (Photo by Steve Marcus/Getty Images)